Carburetor



A. J. BRIGHT Nqv. 26, 1929.

CARBURETOR Filed Nov. 28, 1925 2 Sheets-5heat Nov. 26, 1929. A. J. BRIGHT CARBURETOR 2 Sheets8heet Filed Nov. 28, 1925 am zmtoz Patented Nov. 26, 1929 CARBURETOR Application filed November as, 1925-. Serial m. 72,016.

This invention aims to provide novel means for regulatlng, in various ways, the

supply of fuel in a carburetor.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the comblnation and arrangement of partsand in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the in- 1 vention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings Figure 1 shows in side elevation, a device constructed in accordance with the invention; Figure 2 is a longitudinal section, parts being omitted; Figure 3 is a top plan, the cover for the body of the carburetor being removed, and parts appearing in section; Figure 4 is a section taken through the float tank and attendant parts; Figure 5 is a bottom plan view of the cover for the float tank.

The carburetor forming the subject matter of this application includes a body 1 provided with an air inlet 4 and equipped, at

a point op osite to the air inlet 4, with a mixing eham er and outlet for the mixture,

marked by the numeral 3. The flow of the mixture to the engine, from the chamber 3, is regulated by an adjustable throttle valve mechanism designated by the numeral 7. The body 1 has a detachable cover 5. The body 1 is supplied with an internal partition 33 located at the inner end of the mixing chamber 3. Within the body 1, a guideway 31 is fashioned, the guideway communicating with the air inlet 4 and with the' mixing chamber 3 and being disposed at right angles to those elements. There is a small opening 2 in the bottom of the guideway 31, which serves as a vent and drain.

The numeral 19 marks a float chamber having a lateral extension 29 provided with a passage 54. The extension 29 of the float chamber 19 is detachably secured to the body body 1 being supplied with a stop lug) 27,

1, as shown in Figure 2. A nozzle is disposed in the passage 54 and is threaded into the body 1, the nozzle discharging into the mixing chamber 3. A bore 6 establishes communication between the passage 54 and 55 the nozzle 55 on the one hand, and the float chamber 19 on the other hand. A drain plug 30 is threaded into the part 29 of the float chamber 19, in alinement with the bore 6 and constitutes means whereby the float chamber- 19 may be drained.

The float chamber 19 carries a detachable cap 8 in which a fluid inlet elbow 20 is mounted. A float 56 operates in the float chamber 19. Oppositely extended levers 49 B5 are fulcrumed on pins 51 held by a securing device 52 in lugs 50 which project downwardly from the cap 8 of the fl'oat chamber 19. The levers 4C9 hear at their ends on the float 56, and, intermediate their ends, the levers cooperate with the head 96 of a slidable valve 57 which controls the admission of fuel into the float chamber 19, through the fuel inlet 20.

The upper end of the nozzle 55 is controlled v by a first or fuel valve 18, in the form of a rod, movable in the cover 5 and in the partition 33. The valve 18 is threaded into a nut or rider 47 located within the body 1 of the carburetor.

The numeral 48 designates a lever, which may be called a first lever, the same having a forked end which is pivotally engaged with the rider or nut 47, the rider or nut being held against rotation by the forked end of the lever. The lever 48 is supplied intermediate its ends with a depending projection 61. The fulcrum means for the-inner end of the first lever 48 embodies an eccentric 43 formed on the head 75 of a shaft 24 journaled on an outstanding bearing 22 carried by the body 1. An arm 23 is adj ustably secured, intermediate its ends, by a set screw 25, on the shaft 24, the

against which one end of the arm 23 a uts, under the actionof a spring 26, the spring 26 being located about the bearing'22,one end of the spring being engaged with one stop lug 27, and the other end of the spring being engaged with the arm 23.

The depending projection. 61 of the lever 48 bears upon the convexed edge 80 of a tapered cam member 46 which is pivoted at 81 to an internal arm 44 which is adjustably secured, by means of a set screw 45, to a shaft 16, mounted to rock in an outstanding bearing 11 on the body 1. An external arm 14 is ad- 'ustably held on the outer end of the shaft 16 y means of a set screw 17. The arm 14 carries an adjusting device 13, such as a screw, ada ted to bear on a stop lug carried by the ody 1, the adjusting device being held I numeral 42 desi nates a coil spring disposed about the axis 0 the screw 39, one end of the ipring engaging the partition 33, as shown in 1 ure 2.

he numeral designates a cup-sha ed air valve, which may be called a second va ve, the same'being slidable in the guideway 31, the valve 35 having a slot 36 receivin the a lever 40. The valve 35 includes an inc ined partition 37 with which the lever 40 cooperates, under the action of the spring 42. The valve 35 comprises a bottom 37 connected with the partition 83 by standards 84. The corn struction of the valve 35 is such that there is an opening 85 through it, the opening 85 in the valve communicating with the air inlet 4 and with the mixing chamber 3.

The general pur ose of the valve 18 is to regulate the flow 0 fuel from the float chamber 19 to the mixing chamber 3, through the nozzle 55, responsive to engine suction, and

the valve 18 has several ad ustments.

The valve, 18 may be rotated by hand, the valve moving endwise, because it is threaded into the nut 47. This adjustment admits enough fuel so that the engine will turn over nicely while it is running idle.

The valve 18 may be adjusted by wa of the arm 23 and the shaft 24. When the s aft 24 is rotated, the eccentric 43, on the head of the shaft, moves in an orbit, the lever 48 being swun the fulcrum for the lever being the point 0 engagement between the projection 61 on the lever and the convexed edge of the cam member 46, the lever being PIVOtally engaged with. the rider 47 on the valve 18, and the valve being caused to move longitudinally. This is the ordinary acceleration adjustment which is made while the car is being driven, or when the engine is first started.

. It is to 'be observed that the edge 82 of the cam member is struck on anarc of which practical speeds at which theengine the element 39 is a center. By positioning the external arm 14 properly, by means of the screw 13, the shaft 16 may be rotated to a position in which the arm 44 and the pivotal mounting 81 of the cam 46 will be so placed that when the lever 40 is operated by the upward movement of the valve 35, the finger 41 will move along the lower edge 82 of the cam 46 without swinging the cam 46. -The cam 46, under-such conditions, is not respon sive to-the movement of the valve 35. This may be regarded as a zero position (shown in Fig. 2), from which an adjustment may be begun, which will render the cam 46 responsive to the movement of the valve35 through the instrumentality of the lever 40 and its finger 41. In order to GfiGCt'SllCh an adjustment, rotation is imparted to the shaft 16 by way-of the screw 13 and the arm 14, the arm 44 swinging the cam 46, with the end of the finger 41 as afulcrum, to such a position that when the valve 35 rises, the lever 40 and its finger 41 will swing the cam 46 on its pivotal mounting81. The tilting or swinging movement which is imparted to the cam 46 from the screw 13, by way of the arm 44, is a hand adjustment, and the relative positions of the parts 61, 41,44, 46, and 16, and the curve shown at 80, are so worked out that this hand adjustment may be made without making any appreciable change in any other adjustment.

The finger 41 constitutes a fulcrum for the cam 46, and by rocking the cam 46 on the finger 41, so that the free end of the cam is moved closer to the pivot 39 of the finger 41, the valve 18 is caused to rise when the valve 35 rises, thus increasing the flow of fuel. Owing to the specific curve of the lower edge of the cam 46, a neutral point is obtained in which the valve 35 will riseand fall without imparting movement to the valve 18.

The air passing through the inlet 4,

through the transverse opening 85 in the valve 35 and through the mixing chamber 3, raises the valve, owing to the inclination of the partition 37, the valve tilting the lever 40,

the finger 41 of the lever cooperating with the concaved edge 82 of the cam member 46, the cam member swingingv with the pivot point 81 as a fulcrum, the parts 61,48 and 47 operating the valve 18. This movement takes place automatically, responsive to engine suction.

One of the principal virtues of the carburetor, is that it provides a means whereb a proper mixture may be obtained for a 1 may be running. 1

What is claimed is Acarburetor including a. body having ii fuel inlet, a first valve controllin'g'the" inlet, an air inlet for the body, the body, being provided wlth an outlet for the fuel mixture, a second valve mounted between the air inlet and the outlet, for right-line reciprooation and including an inclined portion, a shaft mounted to rock in the body, the shaft being provided with an eccentric, a first lever mounted pivotally on the eccentric, a second 5 lever fulcrumed on the body and slidably engaged with the inclined portion of the second valve, to be actuated thereby, a cam member engaged between the levers, means for operating the shaft to tilt the first lever on the cam member, a second shaft mounted to rock in the body, an arm on the second shaft, the cam member being pivoted to the arm, means for rocking the second shaft, and mechanism for connecting the first lever and the first valve pivotally, the said mechanism including means for adjusting the first valve with regard to the fuel inlet, independently of the first lever, the inclined portion of the second valve being so placed that air passing from the air inlet to the outlet will engage said inclined portion and operate the second valve.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature. 2s ALVIN J. BRIGHT. 

